[Bug 232387] head -r339076: system crash in vnet_epair_init during kern_jail_set in a kyua test on powerpc64

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232387

--- Comment #12 from Mark Millard <[email protected]> ---
(In reply to Mark Millard from comment #10)

It turns out that my amd64 kernel builds are like
the devel/powerpc64-xtoolchain-gcc ones in that
instead of SHN_ABS it has a normal st_shndx value:
( these are looking at /boot/kernel/kernel )

entry: 16765
        st_name: __start_set_vnet
        st_value: 0xffffffff824dc200
        st_size: 0
        st_info: STT_NOTYPE STB_GLOBAL
        st_shndx: 50

This might suggest powerpc64's kernel having
incomplete coverage for handling such things?

For the amd64 context, that 50 is:

entry: 50
        sh_name: set_vnet
        sh_type: SHT_PROGBITS
        sh_flags: SHF_WRITE|SHF_ALLOC
        sh_addr: 0xffffffff824dc200
        sh_offset: 36553216
        sh_size: 220872
        sh_link: 0
        sh_info: 0
        sh_addralign: 16
        sh_entsize: 0

A constrasting devel/powerpc64-xtoolchain-gcc based
kernel has entries (note the set_vnet sh_flags
differences vs. amd64):
( these are also looking at /boot/kernel/kernel )

entry: 40
        sh_name: set_vnet
        sh_type: SHT_PROGBITS
        sh_flags: 
        sh_addr: 0x1223800
        sh_offset: 18036736
        sh_size: 212656
        sh_link: 0
        sh_info: 0
        sh_addralign: 8
        sh_entsize: 0

and for __start_set_vnet :

entry: 1490
        st_name: __start_set_vnet
        st_value: 0x1223800
        st_size: 0
        st_info: STT_NOTYPE STB_GLOBAL
        st_shndx: 40

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